Bascule-bridge.



. STRAUSS.

BASOULE BRIDGE.

APPLICATION FILED M339, 1906.

Patented 1311.12, 1915.

4 SHEETS-SHEET l.

ITNESSES:

ATTORNEY S J. B. STRAUSS. f BASGULE BRIDGE. APPLICATION FILE-D PEBJQ, 1906 1,124,356. Patented Jan.12,1915.

4 SHEET-SHET 2.

AWQHNEY'S J. BL STRAUSS.

BASGULE BRIDGE. APPLICATION FILED 313.19, 1900.

1,124,356 Patented Jan.12,1915.

- 4 SHEETS-SHEET 3.

Fig.3 .1;

J. B. STRAUSS.

.BASGULE BRIDGE. APPLIGATION IILED FEB. 19, 1906.

1,124,356, Patented Jan. 12, 1915.

4 SHEETS-$HEET 4.

INVENTOH 1/0.

JGSEZPH I8. STRAUSS, OF GHICAGG, ILLINOIS, AFSBZGNOB, TQ STRAUSS BfiifGULE A1533 CONCRETE BRIDGE COMPANY, OFGHICAGG, KLEIN 3153, A. CQRPQRATION 03? ILLEHQIS.

BASCUL'E-BBEDGE.

Specification of Letters Patent.

Patented J 12,

Application filed. February is, 1908. Serial No. 381,?73.

To all whom it may concern:

Be it known that l, Josnen B. Srnnnss, a citizen of the United States, residing at Chicago, in the county Cool: and State of Illinois, have invented a certain new and useful Improvement in Basculedfiridges, of which-the following is a specification.

My invention relates to bascule bridges, and has for its object to provide a new and improved bridge of this description.

Ely-invention is illustrated in the accompanying drawings, wherein Figure 1 is a side elevation in part section illustrating my invention; Figure 2 is a plan vi w with parts broken away; Fig. 3 is a sectional view taken on line 3-3 oi Fif 2; Fig. l: is a. sectional view on line l-4 of Fig. 2. l? 5 is a view showing the support for the main span illustrating the members for-the upward and downward forces. Fig. 6 is a sectional view through the counterweight taken on line 6-6 of Fig. 8 showingthe grooves of the counterweight material. Fig. 7 isa sectional view through that part of the counterweight where the counterweig'ht pin is located. Fig. 8 is" a plan view of the counterweight.

Like letters refer to like parts throughout the several figures.

This invention has among other objects provide what may be called. an underneath type of structure wh'a n the bridge, coun tcrweig'ht and the opr ating mechanism are all beneath the road v.

In the drawings I ve shown one span of the bridge. It is, of course, evident that the bridge may he a single span bridge or there may be two spans, one on each side of the stream, the two connected together at the middle when their operative position.

As shown in the drawings, a main spa-n A. comprising suitable trusses A is mounted upon suitable trunnions, or projecting pins B which work in hearings in the supporting posts C, Cgsa'id trusses passing in between said supporting posts as shown. The trusses A are connected together by the cross pieces 253. (See Fig. 4-.) By this arrangeinent it will be Tl that the supportins posts are symmetiically disposed with relation to the trunnions. There is also suitable bracing for said posts. The floor D ofthe main span does not extend all the way along said main span, but stops at the point at one side of the trunn The rest of the door hack to the al 1 desired manner.

The counterweight L'Fis located beneath the roadway floor .3 and may he made up in any herein shown it cones sists of a main centi 1 cross girder l3 and F2 (see Fig. 2}. The

a longitudinal girders 1 main cross girder is a box girder having interior webs or diaphragms F (see 7) at right angles to the axis of the girder. The longitudinal girders are divided. into two sections, the ends of which abut the cross girders and which are fastened thereto by the plates 1?. At each side oi the counterweight there is a counterweight pin F cantalivered in the main cross girder (see Figs. 2 and 7) said pin passing through holes in the diaphragms F and connecting to a plurality of said diaphragm so that the pin reactions are tigansrnitted to the main cross girder. These pins project beyond the counterweight into suitable bearings F in the trusses. (See Fig. 3.) lit will be seen that by this construction the counterweight is, as it were, concentrated at the points where the pins are connected with the main cross girder and is free to move with relation to the trusses so that the counten weight can keep its horizontal position. The (JOLlfitGlWGlght pin and the trunnion of the main span are in line with the center of gravity of the main span. This will be seen in Fig. l where the center of gravity is diagrammatically represented at A suitable floor is preferably associated with the counterweight girders. The counterweight is preferably cut away so as to receive the cross beams or stringers E ot the roadway fioorwhen the bridge is down so that there would be no interference between the roadway floor and the counterweight. This is illustrated more clearly in Figs. 6 and 8 wherein the counterweight isshown as provided with cut away portions or grooves E the beams or stringers being omitted in Fig. 8 to show these grooves. By this construction the counterweight extends toward the roadway floor between the stringers supporting said floor. Qonnected with the counterweight is a counterweight link F which is pivoted to the counterweight and to the fixed support. T his keeps the counterweight in a proper horizontal position during all the various positions of the main span.

lhe rear end of the main span instead of being made up or" curved members is com posed of series of straight members or chords of a circle 5 and radial members 3? from the trunnion to the intersecting points of said chords (see Fig; 1).

Any suitable'operating mechanism may be used for raising and lowering the main span. As herein shown the main span is provided with a toothed rack J which is engaged by a gear. wheel J connected by suitable reducinggearsjto a motor J This rack and the operating mechanism are bem neath the roadway floor so as to be ,out of the way. "When'the bridge is in its operative position the parts are as shown in'full lines in Fig. 1. When it is desired to. lift the bridge the operating mechanism is start- 5 ed and the'main span moved about the trunnions as pivots. The counterweight moves downwith the rear end of the main span, said rear end movingfaway from thelfixed roadway floor, the counterweight'keeping in a ahorizontal position and assuming the position shown in dottedlines when the bridge is up. When the bridge is again lowered the parts take the position shown in full lines.

It willbe seen by this construction that all as the partsiand operating mechanism are beneath the roadway so that there'are no upwardly projecting parts or mechanism.

It will be noticed that the fixed fioor, the

fixed support, the rear end and the counterso weight are all adapted to work in the limited space between the underside of the roadway and the water line. The various parts are therefore recessed and otherwise adapted to fit into and clear each other during the as operation of the bridge.

The fixed supports on which the trunnions I are mounted and which are arranged in pairs, are so arranged with relation to the counterweight that part of the counter to weight passes by them and intront' thereof when the bridge is open. Said fixed supports or supporting posts are mounted upon bolsters 0, there being side braces 0 for said supporting posts also connected with said bolsters,- the supporting post-s, braces vand bolsters acting'as a unit. The movable section of the bridge is provided with main trusses, said main trusses having the trunnions associated therewith and provided with radial members radiating from the trunnions in straight lines toward the front and rear. The main span is provided with what may be called a double rear end memberfconsisting oi a member upon'which the 5 counterweight pins are mounted and the member acting as-a bumper, and the counterweight pin is in one line of action and the bumper I in the other, the bumper acting.

at the rear of the counterweight pin. This 9 bumper stops the main span when it has reached its lowered position by engagement with the stringer E anchored by the memhers I", and holds itin place. The pressure of this bumper is resisted by the members I which. are properly anchored in any desired manner. The fixed floor and the main span have a joint support, that is, they are supported upon the same device. The support for'the main span embraces members for the upward and downward forces with suitable connections, between them. These members and connections are shown in Figs. 1 and 5.

The members for the upward and downward forces consist of the posts G and the mem- 1 The support forthe main sppn embraces direct acting vertical supporting members for the upward and downward forces in a vertical plane with the trunnions and bumper and suitable horizontal bracing between them, the horizontal bracing consisting of the floor and floor beams at, the top.

I claim:

1. A bascule bridge comprising a main span, two sections of floor, one attached to the main span, the other free therefrom but fixed in position andextending over the rear.

end of the main span, a counterweight attached to the rear end of the main span and disposed to fit between the cross supports of the fixed floor and beneath it.

2. A bascule bridge comprising a main span mounted upon trunnions, a counterweight therefor comprising cross and longitudinalLgirders, a floor associated with said girders arrying the counterweight material, counterweight pins cantalivered in the main cross girder and projecting beyond the counterweight, said pins working-in hearings on the main span. I

3. In a bascule bridge a fixed floor, a counterweight movable with relation to said fixed floor comprising a supporting frame, I

counterweight materialsupported in sr-id frame and extending above said frame and toward the fixed floor, said counterweight material recessed toreceive the supports of said floor.

4. In a bascule bridge a main span mounted upon supports so as to be opened and closed, a counterweight connected with said ma'in'v span, a fixed roadway floor above the counterweight having a, supporting floor system to receive'said counterweight when the main span is in its closed position and arranged so that a part of the floor system and'counterweight are in the same horizontal plane when the main span is closed.

5. .A bascule bridge comprising a main span, a counterweight frame comprising a main cross girder and longitudinal girders,

masses 3 said cross girder acting as a main support for the'longitudinal girders and provided with a plurality of separated liaphragms and pins at the ends of said cross girder for connection with the main span, each of said pins having a bearing in a plurality of-said diaphragms, said pins having bearing ends projecting beyond the cross girder.

6. In a bascule bridge a main cross girder provided with 2i, plilrelit of separated dia- 10 

